The EC Archives: The Haunt of Fear #2

Young Rodney Whitman loses his parents in an automobile accident and goes to live with relatives. When he reaches twenty he realizes there is only one spot left in the family crypt and wishes to secure it for himself, thus he murders his three living relatives and disposes of their bodies in the swamp, lake, and cellar. The zombies return, dismember Rodney, and claim the remaining casket for themselves.